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A platform for research: civil engineering, architecture and urbanism
Inclusion of site-effects: An approach coherent with contemporary event-based PSHA practices
https://orcid.org/0000-0002-0303-3524
https://orcid.org/0000-0002-0520-6951
Abstract Contemporary probabilistic seismic hazard analysis (PSHA) is performed using an event-based approach, and that has motivated the review of the methods to consider site-effects within that analysis framework. Shortly after the classic proposal of PSHA, that only aimed at estimating ground motion levels for rock conditions, different ways to estimate the modifications of the amplitude at surface level because of soft soils were developed. To date, different approaches have been proposed, although they seem to be better suited for convolution-based PSHA, where the numerical integration of analytical functions is performed. This paper presents a proposal to consider site-effects within an event-based PSHA framework, and compares the obtained results with those of two commonly used methods. Different sensitivity tests related to variations of assumptions of the model are shown, in order to facilitate understanding the results.
Highlights Site-effects in probabilistic seismic hazard analysis are of key relevance in the presence of nonlinear soil deposits. The methodology presented incorporates site-effects objectively into a contemporary event-based PSHA framework. The proposed methodology is compared with two simplified procedures to incorporate site-effects in PSHA. Simplified procedures fail to correctly incorporate nonlinear effects for long return periods (large intensity levels). Failure of simplified approaches is related to the decrease of the standard deviation at surface level.
Inclusion of site-effects: An approach coherent with contemporary event-based PSHA practices
https://orcid.org/0000-0002-0303-3524
https://orcid.org/0000-0002-0520-6951
Abstract Contemporary probabilistic seismic hazard analysis (PSHA) is performed using an event-based approach, and that has motivated the review of the methods to consider site-effects within that analysis framework. Shortly after the classic proposal of PSHA, that only aimed at estimating ground motion levels for rock conditions, different ways to estimate the modifications of the amplitude at surface level because of soft soils were developed. To date, different approaches have been proposed, although they seem to be better suited for convolution-based PSHA, where the numerical integration of analytical functions is performed. This paper presents a proposal to consider site-effects within an event-based PSHA framework, and compares the obtained results with those of two commonly used methods. Different sensitivity tests related to variations of assumptions of the model are shown, in order to facilitate understanding the results.
Highlights Site-effects in probabilistic seismic hazard analysis are of key relevance in the presence of nonlinear soil deposits. The methodology presented incorporates site-effects objectively into a contemporary event-based PSHA framework. The proposed methodology is compared with two simplified procedures to incorporate site-effects in PSHA. Simplified procedures fail to correctly incorporate nonlinear effects for long return periods (large intensity levels). Failure of simplified approaches is related to the decrease of the standard deviation at surface level.
Inclusion of site-effects: An approach coherent with contemporary event-based PSHA practices
https://orcid.org/0000-0002-0303-3524
https://orcid.org/0000-0002-0520-6951
Abstract Contemporary probabilistic seismic hazard analysis (PSHA) is performed using an event-based approach, and that has motivated the review of the methods to consider site-effects within that analysis framework. Shortly after the classic proposal of PSHA, that only aimed at estimating ground motion levels for rock conditions, different ways to estimate the modifications of the amplitude at surface level because of soft soils were developed. To date, different approaches have been proposed, although they seem to be better suited for convolution-based PSHA, where the numerical integration of analytical functions is performed. This paper presents a proposal to consider site-effects within an event-based PSHA framework, and compares the obtained results with those of two commonly used methods. Different sensitivity tests related to variations of assumptions of the model are shown, in order to facilitate understanding the results.
Highlights Site-effects in probabilistic seismic hazard analysis are of key relevance in the presence of nonlinear soil deposits. The methodology presented incorporates site-effects objectively into a contemporary event-based PSHA framework. The proposed methodology is compared with two simplified procedures to incorporate site-effects in PSHA. Simplified procedures fail to correctly incorporate nonlinear effects for long return periods (large intensity levels). Failure of simplified approaches is related to the decrease of the standard deviation at surface level.
Inclusion of site-effects: An approach coherent with contemporary event-based PSHA practices
Ordaz, Mario (author) / Mánica, Miguel A. (author) / Salgado-Gálvez, Mario A. (author) / Osorio, Luis (author)
2022-04-02
Article (Journal)
Electronic Resource
English
Site Response Effects on Partially Ergodic PSHA
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